Statisztikus Fizikai Szemináriumok
Seminars in Statistical Physics

A szemináriumokat az Elméleti Fizikai Tanszék (1117 Budapest, Pázmány Péter sétány 1/A, azaz Északi tömb) keretében szervezzük. Az előadások ebben a félévben az É 2.54-es teremben (Novobátzky Károly terem) kerülnek megrendezésre. Szokásosan szerdán de. 11-kor kezdünk. Ha ettől eltérő időben vagy más teremben tartjuk az előadást, azt külön jelezzük. Az előadás címét általában annak nyelvén hirdetjük meg.


The seminars are held at the Institute for Theoretical Physics, Eötvös University (1117 Budapest, Pázmány Péter sétány 1/A, i.e. Northern Block near Petőfi bridge, western bridgehead). This semester the seminars are held in room É 2.54 (Novobátzky Károly Hall). Usually the seminar is on Wednesday 11 am. If we deviate from the standard times or location, there will be an extra warning. We announce generally the title of the lecture in the language the speaker will use.

Extraordinary Seminar

ELTE TTK Northern Building 1.125

10:00, June 26th 2017

László B. Kish

Department of Electrical and Computer Engineering, Texas A&M University

Facts and myths about zero-point thermal noise and Information entropy versus thermal entropy

- The existence of non-zero Johnson noise when approaching zero temperature has been debated many times, yet it is almost generally accepted. We point our that the acceptance of non-zero zero-point noise leads to perpetual motion machines that violates the Second Law of Thermodynamics. The Fluctuation- Dissipation Theorem for voltage/current noise is unacceptable in its present form in the quantum limit and the correct theoretical result must depend on the particular type of noise measurement system.

- Information entropy and thermal entropy are apples and oranges and they do not generally obey Brillouin's principle and never satisfy Landauer's erasure dissipation principle for memories.

References

L.B. Kish, G.A. Niklasson, C.G Granqvist, "Zero-point term and quantum effects in the Johnson noise of resistors: A critical appraisal", J. Stat. Mech. 2016 (2016) 054006.

L.B. Kish, G.A. Niklasson, C.G. Granqvist, "Zero thermal noise in resistors at zero temperature", Fluct. Noise. Lett. 15 (2016) 1640001.

L.B. Kish, D.K. Ferry, "Information entropy and thermal entropy: apples and oranges", arXiv:1706.01459

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